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Income Taxes - Sources of Income before Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Domestic	$ 37.1	$ 3.1	$ 16.8
Foreign	94.5	125.0	86.3
Income before income tax expense	$ 131.6	$ 128.1	$ 103.1

X

- Definition

The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
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- Definition

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

+ References

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-Publisher FASB
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-Topic 250
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- Definition

The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile.

+ References

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-Name Accounting Standards Codification
-Topic 235
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